// 生产模式
const { merge } = require("webpack-merge");
const commonConfig = require("./webpack.common");
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const OptimizeCssAssetsWebpackPlugin = require('optimize-css-assets-webpack-plugin');
const TerserWebpackPlugin = require('terser-webpack-plugin');
const path = require('path')
// 生产模式
module.exports = merge(commonConfig, {
  mode: 'production',
  output: {
     filename: '[name].[chunkhash:8].js',
     path: path.resolve(__dirname,'dist')
  },
  //提取公共代码、压缩js和css代码 
  optimization: {
    // 提取公共模块
    splitChunks: {
      chunks: 'all'
    },
    // 压缩js css代码
    minimize: true,
    minimizer: [
      new TerserWebpackPlugin(),
      new OptimizeCssAssetsWebpackPlugin()
    ]
  },
  module: {
    rules: [
      // 分离css文件
      {
        test: /\.less$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'less-loader']
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader']
      },
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: './public/index.html',
      title: 'jack webapck',
      favicon: "./public/favicon.ico",
      minify:{
        removeComments: true, // 去注释
        collapseWhitespace: true, // 去空格
        removeAttributeQuotes: true // 去属性引用
      }
    }),
    // 分离css文件
    new MiniCssExtractPlugin({
      filename: '[name].[chunkhash:8].css'
    }),
  ]
})